JP2009127898A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of efficiently heating even a lower face of a heated object while simplifying a constitution. <P>SOLUTION: Hot air jetting ports 5a, 5b are formed on an upper portion of a heating chamber 2 to supply hot air to a top face of the heated object, further a radiation heater 24 is disposed at a lower part of a heated object loading member 21, a non-air permeable hot air guide plate 25 is disposed between a lower part of the radiation heater and a heating chamber bottom plate, and the hot air for heating the top face of the heated object 8 is guided by the hot air guide plate and flows to a hot air suction port along a lower face of the heated object. Since the hot air after heating the top face of the heated object forcibly flows between the heated object and the hot air guide plate toward the hot air suction port, and heats the lower face of the heated object while being reheated by the radiation heater, the lower face of the heated object can be efficiency heated together with radiation heat from the radiation heater. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooking device that blows hot air onto an object to be heated to heat the object to be heated in a short time.

  2. Description of the Related Art In general, a cooking device that heats an object to be heated in a short time by directly blowing high-speed hot air along with the microwave on the object to be heated is known (Patent Document 1).

This heating cooker spouts hot air generated by the hot air supply means 101 as a high-speed flow from a jet port 103 provided at the upper and lower portions of the heating chamber 102, and heats the high-speed flow of hot air directly on the object to be cooked. It is like that. In order to heat the food to be cooked uniformly, the hot air passage 104 is tapered to make the jet pressure uniform, and at the same time, the food to be cooked is placed on the turntable 105 and rotated.
JP-A-7-108234

  Since the heating cooker described in the above-mentioned Patent Document 1 blows hot hot air on the food to be cooked in a high-speed flow, the amount of heat that the hot air has can be given to the food to be cooked in a short time. It has the advantage that it can be cooked in a very short time compared to hot air ovens, and is used in fast food stores and the like.

  However, the configuration is complicated because the hot air jet 103 is provided in two upper and lower portions. When the jet 103 is provided only in the upper part of the heating chamber 102, for example, the lower surface is lower than the upper surface of the object to be heated. There has been a problem that the heating state becomes worse, and improvement has been demanded.

  The present invention has been made in view of such conventional problems, and is intended to efficiently heat the lower surface of an object to be heated while simplifying the configuration.

  In order to solve the above problems, the present invention has a structure in which a hot air outlet is provided at the upper part of the heating chamber and hot air is blown on the upper surface of the object to be heated, and a radiant heater is provided below the object to be heated. In addition, a non-breathable hot air guide plate is provided below the radiation heater and between the heating chamber bottom plate, and the hot air that has heated the upper surface of the object to be heated is guided by the hot air guide plate. It is set as the structure which flows into a hot-air inlet along the lower surface of a heating thing.

  As a result, the hot air after heating the upper surface of the object to be heated forcibly flows between the object to be heated and the hot air guide plate toward the hot air suction port, and at that time, the object to be heated is reheated by the radiant heater. The lower surface of the object to be heated is combined with the radiant heat from the radiant heater, so that the lower surface of the object to be heated is efficiently heated.

The heating cooker of the present invention heats the lower surface of the object to be heated with hot air guided by the hot air guide plate and reheated by the radiant heater and the radiant heater. Even in such a case, the lower surface of the object to be heated can be efficiently heated, and the upper and lower surfaces of the object to be heated can be heated in a short time even with a simple configuration in which the hot air outlet is provided at the upper part of the heating chamber. . In addition, as described above, the hot air outlet may be only the upper part of the heating chamber, so that the structure can be simplified and the bottom surface temperature of the cooking device can be kept low by the heat shielding action of the hot air guide plate. Can be used safely without causing thermal degradation.

  The present invention includes a heating chamber, high-frequency generating means for supplying microwaves to the heating chamber, and hot air supply means for supplying hot air to the heating chamber, and the heating chamber has a hot air outlet on its upper wall. A hot air suction port is provided at the bottom of the heating chamber so that the hot air in the heating chamber is circulated from the upper part to the lower part of the heating chamber, and the lower part of the heating chamber and above the hot air suction port is air permeable. The heated object mounting member is provided and a radiant heater is provided below the heated object mounting member, and the non-ventilated hot air guide plate is provided below the radiant heater and between the heating chamber bottom plate and the heating chamber bottom plate. The hot air that has heated the upper surface of the object to be heated and passed through the object to be heated is guided by the hot air guide plate and flows to the hot air inlet, and the upper surface of the object to be heated is Hot air after heating Passing through the heated object mounting member and forcibly flowing between the heated object mounting member and the hot air guide plate, the lower surface of the heated object is heated while being reheated by the radiant heater. Even if the hot air outlet has a simple structure only at the upper part, combined with the radiant heat from the radiant heater, the lower surface of the object to be heated can be efficiently heated, the heating time can be shortened, and the hot air guide plate has a heat shielding effect. Therefore, the temperature of the bottom of the heating chamber and hence the bottom of the cooking device can be kept low, and the equipment installation floor can be used without anxiety.

  According to a second aspect of the present invention, in the first aspect, the hot air outlet is provided in a front portion of the upper wall of the heating chamber, the hot air inlet is provided in a lower portion of the rear wall of the heating chamber, and the hot air outlet has hot air. As a configuration that ejects obliquely toward the rear of the heating chamber and ejects substantially vertically downward toward the lower portion of the heating chamber, hot air that is ejected substantially vertically downward is supplied from the front of the heating chamber to the hot air guide plate and the object to be heated. It is configured to forcibly flow through and guide it to the hot air inlet of the rear wall of the heating chamber, and the hot air blown diagonally from the front upper part to the rear lower part of the heating chamber wraps the object to be heated in high density. The upper surface of the object to be heated is uniformly heated, and the hot air jetted substantially vertically downward is heated from the front of the heating chamber and circulates by heating the object to be heated. Flow between the hot air guide plate and the lower surface of the object to be heated. Will be heat, it is possible to short time and uniformly heated reliably an object to be heated upper and lower surfaces by hot air heated lower surface of the object to be heated.

  Furthermore, in the first and second inventions, the third invention has a configuration in which the upper surface of the hot air guide plate is subjected to high reflection treatment, and the radiant heat of the radiant heater can be efficiently used for an object to be heated. Furthermore, the heating time can be shortened.

  The fourth invention is the first to third inventions, wherein the hot air guide plate is made of a material with good heat insulation, and heat insulation for the bottom of the heating chamber is added to further reduce the temperature of the equipment bottom. I can plan.

  In addition, in a fifth aspect of the present invention, in the first to fourth aspects, a hot air supply means is provided outside the rear wall of the heating chamber, and the hot air from the hot air supply means is supplied to the hot air outlet on the front wall of the heating chamber. A guide duct is provided near one side outside the upper wall of the heating chamber, and a waveguide that guides microwaves from the high-frequency generating means into the heating chamber is provided at a substantially central portion of the upper wall of the heating chamber, so that the microwave is heated. It is possible to radiate microwaves efficiently toward the object to be heated in the heating chamber, and the object to be heated can be heated in a shorter time.

A sixth invention is the fourth invention, wherein a duct heater is provided in the duct, and the hot air circulating through the hot air supply means and the heating chamber is heated to a high temperature by the duct heater and the radiant heater, and the temperature of the hot air is increased. Therefore, heating can be performed in a shorter time.

  According to a seventh invention, in the first to sixth inventions, the heating chamber is formed in a substantially rectangular shape having a lateral width larger than the vertical width, and the hot air supply means is for circulating at least two hot air in the lateral direction of the heating chamber. It is possible to circulate a large amount of hot air at high speed and to supply a large amount of hot air even with a small heating cooker with a small vertical dimension. Can be heated.

  The eighth invention is the first to seventh inventions, wherein the heating chamber and the hot air supply means are configured to circulate without releasing the hot air circulating between the heating chamber and the hot air supply means as an airtight configuration, Since the low temperature outside air does not mix with the circulating hot air, the hot air temperature can be maintained high, and the object to be heated can be heated in a shorter time.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 6, 1 is a main body of the cooking device, 2 is a heating chamber provided in the main body, and has a substantially rectangular cross section with a large width relative to the vertical width, and the front opening 3 is formed at the lower part of the main body. It can be opened and closed by a pivotally supported door 4. Reference numeral 5 denotes a hot-air jet provided in the upper part of the upper wall of the heating chamber 2. As is apparent from FIG. 3, the upper wall of the front part of the heating chamber provided with the hot air outlet 5 is formed on a surface formed in a substantially horizontal direction with the first hot air outlet 5a provided on the surface formed with a downward slope toward the rear. The hot air from the first hot air outlet 5a is blown obliquely downward toward the object 8 and the hot air from the second hot air outlet 5b is directed substantially vertically downward. It is as composition to erupt. The total opening area of the second hot air outlet 5b is set to be approximately 1/7 or less of the first hot air outlet 5a. Reference numeral 7 denotes a hot air inlet provided in the lower part of the rear wall of the heating chamber 2, and a number of holes are provided along the width of the heating chamber 2, and 10 is provided in the rear wall of the heating chamber 2. The hot air supply means sucks the air in the heating chamber 2 from the hot air inlet 7 and circulates the air from the first and second hot air outlets 5 and 6 into the heating chamber 2, and heats the air from the fan 11. It consists of the heater 12 which performs. As is apparent from FIG. 6, the two blowers 11 are provided independently in the lateral direction of the heating chamber 2, and the fan cases 12 of the two blowers 11 are attached to the blower case 13 so as to be covered with the blower case 13. Unitized. And the duct 15 is attached to the upper surface proper position of this air blower case 13 via the confluence | merging duct 14 (refer FIG. 3) which joins the air from the air blower opening (not shown) of each said air blower case 13, This duct 15 The end opening 15a is communicated with the hot air outlet 5 provided over the entire width of the front portion of the upper wall of the heating chamber via the second duct 16. Further, the guide tube 7 a of the hot air inlet 7 at the lower part of the heating chamber is opened in the blower case 13, and the air from the blower 11 is supplied to the first through the junction duct 14, the duct 15, and the second duct 16. The air in the heating chamber 2 forms a circulating flow that is sucked into the blower 11 through the hot air suction port 7 and the guide tube 7a from the second hot air outlets 5a and 5b to the heating chamber 2.

  The heater 12 is provided in the duct 15 and is incorporated through a heater opening 15b (see FIG. 6) provided on one side of the duct 15. As shown in FIG. 4, the heater 12 is unitized by incorporating a substantially U-shaped duct heater 18 through a lever 17 a in a heater holding frame 17, and the heater mounting plate 19 is screwed to the side of the duct 15. And fixed. In the figure, 19a is a sheathed heater insertion hole, and 20 is a motor of the blower 11.

Reference numeral 21 denotes a member to be heated provided in the heating chamber 2, which is provided on one side of the heating chamber so as to be freely drawn out to one of support members 22 such as ceramics provided in two upper and lower stages. The heated object placing member 21 is for placing the heated object 8 and is located above the position of the hot air inlet 7 as shown in FIG. The hot air which heated the to-be-heated material 8 is comprised so that it may flow to the said hot air inlet 7 (it can pass). Reference numeral 24 denotes a radiant heater provided at the bottom of the heating chamber so as to be positioned below the heated object placing member 21 and is formed by bending a sheathed heater into a substantially U shape.

  Reference numeral 25 denotes a hot air guide plate disposed immediately below the radiant heater 24 and between the heating chamber bottom plate. The lower portion of the heating chamber 2 is divided by the hot air guide plate 25, and is made of a highly heat insulating material. The upper surface thereof, that is, the surface on the heated object 8 side is subjected to high reflection treatment. This hot air guide plate 25 heats the upper surface of the article to be heated 8 and the hot air from the first hot air outlet 5a that wraps around downward, and hot air jetted from the second hot air outlet 5b in a substantially vertical downward direction. It guides to the hot air inlet 7. That is, the hot air from the first hot air outlet 5a hits the upper surface of the object to be heated and then flows around the object to be heated and flows toward the hot air inlet 7 by the hot air guide plate 25. All of the hot air jetted from the two hot air outlets 5b substantially vertically downward passes through the heated object mounting member 21 and collides with the hot air guide plate 25, and then the hot air guide along the hot air guide plate 25. It flows to the hot air inlet through the space between the plate 25 and the lower surface of the article 8 to be heated. At that time, the radiant heater 24 radiates and heats the object to be heated 8 and reheats the hot air.

  Reference numeral 27 denotes a magnetron serving as a high frequency generating means for supplying microwaves to the heating chamber 2, and two magnetrons are provided in the machine chamber 28 on the side of the heating chamber 2. In addition to the magnetron 27, the machine room 27 is provided with a high-pressure transformer 29, a cooling fan (not shown) for cooling these components, a control unit (not shown) for controlling the components, and the like. An operation unit (not shown) for instructing operation on / off, various cooking, and displaying the state is provided on the front side of the main body 1 facing the front of the machine room. Reference numeral 30 denotes a waveguide for guiding the microwaves radiated from the antennas 31 of the magnetrons 27 to the heating chambers. Two waveguides corresponding to the magnetrons 27 are received at the center of the upper wall of the heating chamber 2. is there. Reference numeral 32 denotes a rotating antenna that radiates microwaves from the waveguide 30 into the heating chamber 2, and is provided at a substantially central portion of one common microwave radiation chamber 33 communicated with each waveguide 30. The rotation driving motor (not shown) is provided in the motor cooling duct 34. Reference numeral 35 denotes a ceiling plate provided in the lower opening of the common microwave radiation chamber 33, which is formed of ceramic or the like that can transmit microwaves.

  Reference numeral 36 denotes a cooling fan provided on the fan shaft of the blower 11 for circulating hot air, which cools the space between the main body 1, the heating chamber 2 and the blower case 13 and the machine chamber 28. The cooling fan 36 sucks outside air from an air inlet 37 provided on the back surface of the main body 1 and cools the main body 1 by flowing the outside air between the main body 1 and the heating chamber 2 and the blower case 13 and the machine chamber 28. The cooled hot air is exhausted to the outside from an exhaust port 38 provided at one upper corner of the back surface of the main body.

  Next, the operation of the heating cooker with the above configuration will be described.

  When the user sets, for example, frozen pizza and turns on the operation switch, the control unit starts energizing the magnetron 27, the hot air supply means 10, the radiant heater 9 and the like, and controls them according to a predetermined sequence.

  The hot air supply means 10 starts rotating, the duct heater 18 of the heater 12 generates heat, and the radiant heater 9 of the heating chamber 2 also generates heat. When the object to be heated is a frozen object such as a frozen pizza, each magnetron 27 starts oscillating and radiates microwaves, which are guided by the waveguide 30 to reach the microwave radiation chamber 33, As the rotating antenna 32 rotates, microwaves are radiated almost uniformly throughout the heating chamber 2 to heat the article 8 to be heated from the inside.

  The hot air supply means 10 jets air from the blower 11 from the first and second hot air outlets 5a and 5b to the heating chamber 2 via the merging duct 14, the duct 15, and the second duct 16. At that time, the air flow from the blower 11 is heated to a high temperature by the heater 12 in the duct 15 to become hot air, and heats the upper surface of the object to be heated 8 in the heating chamber 2.

  Here, most of the hot air that heats the object to be heated 8 is jetted obliquely toward the object to be heated 8 from the first hot air outlet 5a provided at the front of the upper wall of the heating chamber 2, and the hot air inlet port. Since 7 is provided in the lower rear part of the heating chamber 2, the hot air from each hole constituting the first hot air outlet 5 extends long from the front to the rear side of the heated object 8 when contacting the heated object 8. It will be. Since each hole is provided in a strip shape over the entire width of the heating chamber 2, the hole extends over the entire area of the object to be heated and is heated so as to wrap the object to be heated.

  The hot air that has heated the upper surface of the heated object 8 passes through the heated object mounting member 21 around the heated object 8 and hits the hot air guide plate 25, and is heated along the lower surface of the heated object 8. While the lower surface of the object is heated, the air is sucked from the hot air inlet 7 at the lower part of the heating chamber to the blower 11 and circulates between the heating chamber 2 and the hot air supply means 10. At that time, the hot air sucked from the hot air suction port 7 at the lower part of the heating chamber to the blower 11 is reheated by the radiant heater 24 at the bottom of the heating chamber, and becomes a hot circulating hot air.

  On the other hand, a part of the hot air is ejected substantially vertically downward from the second hot air outlet 5b, and all of the hot air passes through the heated object mounting member 21 and collides with the hot air guide plate 25, and then along the hot air guide plate 25. Then, the air flows into the hot air inlet 7 while being reheated by the radiant heater 24 through the space between the hot air guide plate 25 and the lower surface of the article 8 to be heated. Therefore, the lower surface of the object to be heated is heated together with the hot air from the second hot air outlet 5 b and the radiant heat from the radiant heater 24.

  At this time, the hot air is reheated by the radiant heater 24 and the temperature further rises, and the entire lower surface of the article to be heated 8 is heated together with the radiant heat from the radiant heater 24. Accordingly, the hot air from the first hot air outlet 5a heats the upper surface of the object to be heated 8 to cause a slight temperature drop, and the heating power is weakened by that amount, or both the heat flows around the lower surface of the object to be heated. Even if the heating power is weakened due to a decrease in temperature, the hot air from the second hot air outlet 5b remains at a high temperature and is reheated by the radiant heater to heat the lower surface of the object to be heated. The lower surface of the heated object can be reliably heated in a short time. Moreover, since it is a hot air, the lower surface of a to-be-heated object can be heated uniformly, without unevenness.

  Further, the hot air jetted from the first and second hot air outlets 5a and 5b is set to 10 to 12 m / sec, which is slightly weaker than the hot air blowing type hot air flow velocity 16 m / sec described in the conventional example. A hot air layer having a high density is formed on the upper surface of the object to be heated 8 in combination with the oblique contact, and the entire area of the object to be heated 8 is uniformly heated. In other words, as in the conventional example, when hot air hits the object to be heated in a perpendicular state, part of the hot air hits the object to be heated and reverses upward, and the lateral spread of the hot air with high temperature becomes thin. When hot air strikes the object to be heated obliquely as in the form of, the upward spots of hot air disappear and all of them spread along the upper surface of the object to be heated. The heated object is encased in the hot air layer having a high density, so that almost the entire area of the object to be heated 8 is heated substantially uniformly and heating with less unevenness in the burnt eyes or the like becomes possible.

In addition, since two blowers 11 that supply hot air are provided in the horizontal direction along the horizontally long shape of the heating chamber 2, the amount of air can be increased as compared with the case of a single blower 11. That is, in the case of a horizontally long heating chamber, the fan diameter of the blower 11 is regulated by the narrow vertical dimension of the heating chamber. Therefore, the fan diameter of the blower 11 must be selected to be relatively small, and the air volume is inevitably small. In this embodiment, the heating chamber 2 is set to a horizontally long size and heated. Since the two blowers 11 having left and right fan diameters about the vertical dimension of the chamber are provided, the air volume can be increased accordingly. Accordingly, the slow flow rate of hot air can be compensated for by increasing the amount of hot air, and the amount of heat applied to the object to be heated 8 can be made equal to or higher than that of the conventional one, enabling heating in a shorter time. Become. Of course, in this case, the amount of heat for heating the wind from the blower 11 is the same as that of the conventional one. In this embodiment, the radiation heater 24 at the bottom of the heating chamber is composed of two 1500 W sheathed heaters. The duct heater 18 is one U-shaped sheathed heater of 2900W.

  Furthermore, the circulation path such as the heating chamber 2 and the hot air supply means 10 and the duct 15 connecting them with each other has an airtight structure so that only the air in the heating chamber 2 and the hot air supply means 10 circulates. It is possible to circulate hot air at a higher temperature than that in which the hot air is circulated while taking a part of the hot air and discharging it to the outside.

  On the other hand, the microwaves from each magnetron 27 are guided to the two waveguides 30 and collected in one microwave radiation chamber 33, and are heated from the rotary antenna 32 having a size that almost covers the ceiling of the heating chamber 2. Therefore, the object to be heated 8 can be microwave-heated strongly and almost uniformly. In this embodiment, the rotating antenna 32 is configured as one, but the rotating antenna 32 may be two rotating antennas having different diameters, or the rotation may be stopped or rotated toward an arbitrary place as an antenna having strong radio wave directivity. Thus, it is possible to heat more uniformly.

  Due to the synergistic effect of the operation as described above, the object to be heated 8 can be cooked in a very short time in this cooking device. For example, heating six pieces of bread is about 75 seconds, and one hamburger-type one that is cut and opened with bread and cheese is heated in about 40 seconds, which is much shorter than the conventional household microwave oven. As time cooking became possible, the heating of the six breads had almost uniform scorching.

  As described above, the cooking device of the present invention heats the lower surface of the object to be heated with hot air and the radiant heater that is guided by the hot air guide plate and reheated by the radiant heater, The lower surface of the object to be heated can be efficiently heated even with the reduced hot air, and the upper and lower surfaces of the object to be heated can be heated in a short time even with a simple configuration in which a hot air outlet is provided in the upper part of the heating chamber. can do. However, the hot air outlet only needs to be the upper part of the heating quality, and the structure can be simplified, and the bottom temperature of the cooking device can be kept low by the heat shielding action of the hot air guide plate, so that the equipment installation floor surface is not thermally deteriorated. It can be used with peace of mind.

External appearance perspective view of the heating cooking machine in Embodiment 1 of this invention External perspective view when the door is opened Sectional view when the door is opened Cross section viewed from the front External perspective view when the body of the main body is removed The exploded perspective view of the principal part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Heating chamber 4 Door 5 1st hot air outlet 6 2nd hot air outlet 7 Hot air inlet 10 Hot air supply means 12 Heater 15 Duct 24 Radiation heater 27 Magnetron (high frequency generating means)
30 Waveguide

Claims (8)

A heating chamber; a high-frequency generating unit that supplies microwaves to the heating chamber; and a hot-air supply unit that supplies hot air to the heating chamber. The heating chamber has a hot-air outlet on its upper wall and a heating chamber. A hot air suction port is provided in the lower part to circulate hot air in the heating chamber from the upper part to the lower part of the heating chamber, and a breathable heated object in the lower part of the heating chamber and above the hot air suction port By providing a mounting member and providing a radiant heater below the heated object mounting member, and providing a non-breathable hot air guide plate below the radiant heater and between the heating chamber bottom plate A heating cooker configured such that hot air that has heated the upper surface of an object to be heated and passed through the object to be heated is guided by the hot air guide plate and flows to the hot air inlet. The hot air outlet is provided in the front part of the upper wall of the heating chamber, the hot air inlet is provided in the lower part of the rear wall of the heating chamber, and the hot air outlet ejects the hot air obliquely toward the rear of the heating chamber and the lower part of the heating chamber. The heating cooking according to claim 1, wherein hot air blown substantially vertically downward is guided from the front of the heating chamber to a hot air suction port on the rear wall of the heating chamber by a hot air guide plate. vessel. The cooking device according to claim 1 or 2, wherein the upper surface of the hot air guide plate is subjected to a high reflection treatment. The cooking device according to any one of claims 1 to 3, wherein the hot air guide plate is formed of a material having good heat insulation. Hot air supply means is provided outside the rear wall of the heating chamber, and a duct for guiding the hot air from the hot air supply means to the hot air outlet at the front of the upper wall of the heating chamber is provided near one side outside the upper wall of the heating chamber. A waveguide that guides the microwave from the high-frequency generating means into the heating chamber is provided at a substantially central portion of the upper wall of the heating chamber to radiate the microwave from the upper wall of the heating chamber. The heating cooker according to item 1. The cooking device according to claim 5, wherein a duct heater is provided in the duct, and the hot air circulating through the hot air supply means and the heating chamber is heated to a high temperature by the duct heater and the radiant heater. The heating chamber is formed in a substantially rectangular shape with a large width relative to the vertical width, and the hot air supply means can circulate a large amount of hot air at high speed by arranging at least two hot air circulation fans in the horizontal direction of the heating chamber. The cooking device according to any one of claims 1 to 6. The heating cooker according to any one of claims 1 to 7, wherein the heating chamber and the hot air supply means are configured to be airtight, and the hot air circulating between the heating chamber and the hot air supply means is circulated without being released to the outside.

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